A method for controlling an air handler includes providing a temperature setpoint to a smart valve in fluid communication with one or more coils of the air handler, providing to the smart valve an air temperature of air conditioned by the air handler, and modulating a valve position of the smart valve using the temperature setpoint, and the air temperature.

An air conditioner and control method for reducing power consumption by controlling pressure or temperature of a refrigerant. The air conditioner includes a compressor compressing a refrigerant and discharging a high pressure refrigerant gas; an outdoor heat exchanger in which the high pressure refrigerant gas is changed to a refrigerant fluid; an outdoor fan to blow outdoor air to the outdoor heat exchanger; a decompressor decompressing the refrigerant fluid into a low pressure state; an indoor heat exchanger changing the decompressed low pressure refrigerant fluid to a refrigerant gas; and a controller configured to control pressure or temperature of the refrigerant based on an operation condition including at least two of a first condition determined based on an installation environment, a second condition determined based on an optimal compression ratio of the compressor, a third condition determined based on outdoor temperature, and a fourth condition set as a default value.

An air conditioner includes a heat pump cycle, a heating unit, a low-temperature side heat medium circuit, and a heat dissipation amount adjustment control unit. The heat pump cycle has a compressor, a condenser, a decompression unit, and an evaporator. The heating unit has a heating heat exchanger, an outside air radiator, and a heat dissipation amount adjustment unit. The low-temperature side heat medium circuit has a heat generation device. The heat dissipation amount adjustment control unit controls the heat dissipation amount adjustment unit to adjust a heat dissipation amount in the outside air radiator such that a blown air temperature of the blown air heated by the heating heat exchanger approaches a predetermined target temperature.

An air conditioner including: a compressor; a heat exchanger fluidly connected to the compressor; a pressure sensor provided in a first flow path connecting an outlet of the compressor to an inlet of the first heat exchanger; a temperature sensor provided in a second flow path connected to an outlet of the heat exchanger; and a processor connected to the compressor, the pressure sensor, and the temperature sensor. The processor configured to: acquire a reference index value based on a first reference pressure measured by the pressure sensor and a first reference temperature measured by the temperature sensor, acquire a measurement index value based on a first measurement pressure measured by the pressure sensor and a first measurement temperature measured by the temperature sensor, and display a shortage of a refrigerant of the air conditioner based on the reference index value and the measurement index value.

The present invention discloses a method for operating a heat cool system during a sensor failure and system thereof. The method comprises determining, by controller, in the event of single or multi-sensor failure, a virtual value of at least a failed sensor based on a plurality of first and second predetermined values; determining the heat cool system run status based on a multi-sensor failure matrix in the event of multi-sensor failure; and obtaining, determining a real-time virtual value of at least the failed sensor based on an interlock value matrix for running heat and cool refrigeration cycles without stopping the heat cool system.

Various embodiments of the present disclosure optimize energy usage of an HVAC system. For example, some embodiments include a method comprising: generating a flow through a heat exchanger; determining a return temperature of fluid having passed through heat exchanger; determining a current flow of the fluid through the heat exchanger; and controlling the flow of the fluid based on a comparison of the determined return temperature with a threshold temperature, wherein the threshold temperature is dependent on the current flow.

A method of controlling an orifice of a valve in an HVAC system to regulate a flow of a primary fluid through a primary side of a thermal energy exchanger of the HVAC system and thereby adjust a thermal energy transfer by the thermal energy exchanger from the primary fluid to a secondary fluid, flowing through a secondary side of the thermal energy exchanger, includes adjusting, by one or more electronic circuits, the orifice of the valve by applying an efficiency control algorithm to a control setpoint for the valve, the efficiency control algorithm processing the control setpoint for the valve to maintain energy-efficient thermal energy transfer. The method further includes the one or more electronic circuits determining the control setpoint for the valve, using current performance values of the HVAC system and recorded historical data of the HVAC system.

A detection method for an air-conditioning system includes detecting whether the input power of the compressor of the air-conditioning system is lower than the power threshold. The method includes obtaining the evaporation saturation temperature of the evaporator of the air-conditioning system and obtaining the condensation saturation temperature of the condenser of the air-conditioning system when the input power is lower than the power threshold. When detecting that the evaporation saturation temperature is greater than the condensation saturation temperature, the method includes determining that an abnormal phase change is occurring and operating the compressor in the full-speed mode. The method includes detecting whether the compressor maintains in the full-speed mode for reaching a first predetermined time when the compressor operates in the full-speed mode, and determining that the refrigerant of the air-conditioning system is leaking if the compressor maintains in the full-speed mode for reaching the first predetermined time.

A method is provided for the controlled routing of hydronic flow within a climate control system. The method includes determining a condition type request for a plurality of area zones corresponding to a particular thermal zone. The method further includes determining a supply temperature type associated with at least a supply line of a primary supply loop and a supply line of a secondary supply loop. The supply temperature type is indicative of a thermal transport fluid temperature within the respective supply line. The method further includes providing an actuation signal set to a valve assembly. The actuation signal set is configured to describe a position for each value of the valve assembly and the position for each valve is based on the conditioning type request and the determined supply temperature types.